# Symbol Iota

From NARS2000

# ⍳ — iota or index; Keystroke ALT+i ; Character (⎕UCS) 9075

## Usage

Monadic use:

- Index Generator: ⍳R

Dyadic use:

- Index Of: L⍳R

## Examples

⍳20 ⍝ Monadic example, generate the set of integers 1 through 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 'ABCDEFG' ⍳ 'BG' ⍝ Dyadic example, find/lookup the letters B and G in the string 'ABCDEFG' (pos 1 = A, pos 2 = B, ... pos 7 = G) 2 7 ⍝ Results found at positions 2 and 7 of string 'ABCDEFG'

## See Also

- Index Generator: ⍳R
- Index Of: L⍳R
- System_Variable_IO ⎕IO or quad IO, Index Origin
- Array Lookup: L⍸R
- Indexing: R[L], R[L]←A, R[L]
*f*←A, L⌷R, L⍉R, L⊃R - Indices: ⍸R

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